Pulmonary Carcinoid Presenting with Acute Pericarditis and Cardiac Tamponade: A Rare Case Report

A BSTRACT Pulmonary neuroendocrine neoplasms are rare malignancies, with typical carcinoid (TC) tumors accounting for 2% of lung cancers. Carcinoid heart disease is uncommon, and pericardial involvement without valvular heart disease is exceedingly rare. We present a 40-year-old male with TC tumor and extensive mediastinal involvement who developed retrosternal discomfort, ultimately diagnosed as carcinoid heart disease. Imaging and clinical evaluation confirmed acute pericarditis, which progressed to impending cardiac tamponade, necessitating emergency pericardiocentesis.